An initial study on drought disasters and climate change in the Yuan Dynasty in the Jinghe and Luohe drainage basins
Received date: 2008-04-10
Revised date: 2008-09-20
Online published: 2009-05-25
Supported by
中国科学院黄土与第四纪地质国家重点实验室项目(SKLLQGOB14);黄土与第四纪地质国家重点实验室自主部署项目(LQ0705);国家自然科学基金项目(40672108)
Based on the historical materials in the Yuan Dynasty in Jinghe and Luohe drainage basins, this paper analyzed the sequence, temporal change and the cause of drought disasters. The results indicated that the Jinghe and Luohe drainage basins suffered from 29 drought disaster events in total, averaged one occurrence every 3.2 years during the 94 years from the early to late Yuan Dynasty (1266AD-1359AD). The drought disasters in the Yuan Dynasty in the Jinghe and Luohe drainage basins were mainly slight ones, which accounted for 44.8% of the total, followed by moderate drought disasters accounting for 37.9% of the total. The occurrence of the severest ones was also higher, being 13.8%, and that of heavy drought disasters were the lowest, or 3.5%. There were diverse changes in the occurrences of drought disasters during the early, middle and late Yuan Dynasty in the Jinghe and Luohe drainage basins. Summer droughts were the main type, followed by spring drought. The successive occurrences of spring and summer droughts as well as four seasons were also higher, only next to spring droughts. The intra-annual variations in the temperature and precipitation were the main cause of the slight and moderate drought disasters. The climatic trend toward drought resulted in the heavy and severest ones during the middle Yuan Dynasty in the two basins. Thus we infer that there was one drought event in the Yuan Dynasty in the Jinghe and Luohe drainage basins, occurring between 1326~1332. Initially, we determined that yearly average precipitation of heavy drought disasters was about 400mm and yearly average precipitation of the severest drought disaster was about 350mm in the main drought disaster areas.
GU Jing, ZHAO Jing-bo, ZHOU Jie, ZHANG you-yin . An initial study on drought disasters and climate change in the Yuan Dynasty in the Jinghe and Luohe drainage basins[J]. GEOGRAPHICAL RESEARCH, 2009 , 28(3) : 663 -672 . DOI: 10.11821/yj2009030011
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